diff --git a/title.core.inc b/title.core.inc
index 2af63f9..0789a82 100644
--- a/title.core.inc
+++ b/title.core.inc
@@ -134,7 +134,18 @@ function title_field_text_sync_get($entity_type, $entity, $legacy_field, $info,
  * Sync back callback for the text field type.
  */
 function title_field_text_sync_set($entity_type, $entity, $legacy_field, $info, $langcode) {
+  // Sync the field back to the language we originally synced from, which will
+  // be ensured by title_field_sync_set().
   $entity->{$info['field']['field_name']}[$langcode][0]['value'] = $entity->{$legacy_field};
+
+  // If there is a stored original value, we have to replace the legacy field
+  // with that one. Also it is important that the langcode is the same,
+  // that we synced on load.
+  if (!empty($entity->{$legacy_field . '_original'})
+    && !empty($entity->{$legacy_field . '_sync_source_lang'})
+    && $entity->{$legacy_field . '_sync_source_lang'} == $langcode) {
+    $entity->{$legacy_field} = $entity->{$legacy_field . '_original'};
+  }
 }
 
 /**
diff --git a/title.module b/title.module
index 8a78716..a93e133 100644
--- a/title.module
+++ b/title.module
@@ -478,6 +478,8 @@ function title_field_sync_get($entity_type, $entity, $legacy_field, $info, $lang
     $entity->{$legacy_field . '_original'} = $entity->{$legacy_field};
     // Find out the actual language to use (field might be untranslatable).
     $langcode = field_language($entity_type, $entity, $info['field']['field_name'], $langcode);
+    // Also remember the language we sync here.
+    $entity->{$legacy_field . '_sync_source_lang'} = $langcode;
     $values = $info['callbacks']['sync_get']($entity_type, $entity, $legacy_field, $info, $langcode);
     foreach ($values as $name => $value) {
       if ($value !== NULL) {
@@ -512,6 +514,26 @@ function title_field_sync_set($entity_type, $entity, $legacy_field, $info, $lang
     // Find out the actual language to use (field might be untranslatable).
     $field = field_info_field($info['field']['field_name']);
     $langcode = field_is_translatable($entity_type, $field) ? $langcode : LANGUAGE_NONE;
+    // If we saved the synced language in title_field_sync_get, we only want
+    // to sync back to that language. Not always the entity source language,
+    // because that can lead to data loss, if we are not currently on the source
+    // language of the node.
+    // Explanation:
+    // If german, for example, is the active language and we load a node, which
+    // source' language is english, the english $node->title (Title EN) will
+    // be replaced with the german title field (Title DE) on node_load through
+    // title_field_sync_get.
+    // Since $langcode is now the source language of the node (en), the english
+    // $node->title would now be replaced with the german title.
+    // This would happen also in title_field_text_sync_set(),
+    // which will sync to the legacy replacement field in english. So now the
+    // english title would be lost both in the node table and also in
+    // field_data_LEGACY_TITLE_FIELD_REPLACEMENT.
+    // So we really need to know from which language we synced and only sync
+    // back to that language.
+    if (!empty($entity->{$legacy_field . '_sync_source_lang'})) {
+      $langcode = $entity->{$legacy_field . '_sync_source_lang'};
+    }
     $info['callbacks']['sync_set']($entity_type, $entity, $legacy_field, $info, $langcode);
   }
 }